Automatic assembly equipment applied to integrated valve stem and assembly detection method thereof

Abstract

The application relates to an automatic assembly equipment applied to an integrated valve rod and an assembly detection method thereof, which comprises a workbench and a control device, the workbench is provided with a circular work station turntable assembly, a plurality of work stations are arranged on the circular work station turntable assembly, a pinhole tool clamp matched with the integrated valve rod is arranged on each work station, pin type stainless steel valve rod feeding and assembling mechanisms, first snap spring feeding and assembling mechanisms, first snap spring positioning and detecting mechanisms, first copper alloy end cover feeding and assembling mechanisms, sealing plastic sleeve feeding and assembling mechanisms, second copper alloy end cover feeding and assembling mechanisms, second snap spring feeding and assembling mechanisms, pressing mechanisms, qualified product discharging mechanisms and substandard product discharging mechanisms are sequentially and circularly arranged around the circular work station turntable. The application realizes full-automatic feeding, assembling and discharging functions, can greatly reduce the labor load of employees, improve the production efficiency and ensure the consistency of finished products.

Description

Technical Field

[0001] This invention relates to the field of automated assembly technology for valve components, and in particular to an automated assembly equipment and assembly and testing method for an integrated valve stem. Background Technology

[0002] An integrated valve stem, as described in patent document CN218761489U, comprises: a stainless steel shaft; a sealing plastic sleeve fitted onto the stainless steel shaft; at least two copper alloy end caps respectively disposed at both ends of the sealing plastic sleeve; and a retaining spring fitted onto the stainless steel shaft and pressing the copper alloy end caps against the sealing plastic sleeve. The sealing plastic sleeve is integrally formed with the stainless steel shaft through an in-mold injection molding process, and the stainless steel shaft has a groove into which the sealing plastic sleeve is at least partially embedded. In the production of this invention, the stainless steel shaft is placed in the cavity of a mold. A sealing plastic sleeve is then formed on the stainless steel shaft using in-mold injection molding. The resulting product forms a tight, secure fit, ensuring no leakage between the sealing plastic sleeve and the stainless steel shaft during use. Furthermore, the stainless steel shaft and sealing plastic sleeve are integrated, resulting in higher strength and greater stability and reliability during operation. Based on the description and accompanying drawings, its structural components can be clearly identified as: a valve stem (stainless steel shaft), and, from bottom to top, a first retaining ring, a first copper alloy end cap, a plastic sleeve, a second copper alloy end cap, and a second retaining ring, all sequentially assembled on the valve stem.

[0003] The structure and assembly process of such integrated valve stems are relatively complex in this field, making installation more difficult. Unfortunately, current production and processing technologies generally rely on manual assembly and inspection throughout the entire process. Therefore, in today's era of high automation and intelligence, traditional manual assembly is extremely inefficient, resulting in inconsistent assembly quality and inadequate inspection. This often leads to defective products being mixed with qualified ones, causing numerous customer complaints. Furthermore, it severely restricts the large-scale production of pipe fittings. With an increasingly scarce labor force and rising labor costs, the company's production costs are significantly increased, hindering its long-term production and development.

[0004] Due to the huge demand for integrated valve stems in the piping field of wall-hung boilers, there is an urgent need to develop automated equipment that can automatically feed, assemble, and test integrated valve stems. Summary of the Invention

[0005] To overcome the above-mentioned shortcomings of the prior art, the present invention provides an automatic assembly device for integrated valve stems.

[0006] The technical solution of this invention to solve its technical problem is: an automatic assembly equipment for an integrated valve stem, comprising:

[0007] A workbench and control device, wherein the workbench is equipped with a circular workstation turntable assembly;

[0008] The circular workstation turntable assembly is provided with several workstations, and each workstation is provided with a pinhole tooling fixture adapted to the integrated valve stem.

[0009] The circular workstation turntable is surrounded by a needle-type stainless steel valve stem feeding assembly mechanism, a first snap ring feeding assembly mechanism, a first snap ring positioning and detection mechanism, a first copper alloy end cap feeding assembly mechanism, a sealing plastic sleeve feeding assembly mechanism, a second copper alloy end cap feeding assembly mechanism, a second snap ring feeding assembly mechanism, a pressing mechanism, a qualified product unloading mechanism, and a defective product unloading mechanism.

[0010] The pinhole tooling fixture includes a rigid base and an adhesive clamping body fixed in the rigid base. The adhesive clamping body has a tooling hole adapted to the needle-type stainless steel valve stem, and the upper end of the tooling hole has a flared area.

[0011] The needle-type stainless steel valve stem feeding and assembly mechanism includes a valve stem vibrating feed plate, a valve stem transfer device, and a valve stem assembly device.

[0012] The first snap ring feeding and assembly mechanism includes a first snap ring vibrating feed plate, a first snap ring transfer device, and a first snap ring assembly device;

[0013] The first snap ring positioning detection mechanism includes a contact detection component and a detection and adjustment device acting on the contact detection component. The contact detection component is communicatively connected to the control device.

[0014] The first copper alloy end cap feeding and assembly mechanism includes a first end cap vibrating feeding plate, a first end cap top lifting device, and a first end cap assembly device.

[0015] The sealing plastic sleeve feeding and assembly mechanism includes a plastic sleeve vibrating feeding plate, a plastic sleeve upper lifting device, and a plastic sleeve assembly device;

[0016] The second copper alloy end cap feeding and assembly mechanism includes a second end cap vibrating feeding plate, a second end cap top lifting device, and a second end cap assembly device.

[0017] The second snap ring feeding and assembly mechanism includes a second snap ring vibrating feed plate, a second snap ring transfer device, and a second snap ring assembly device;

[0018] The qualified product unloading mechanism includes a qualified product unloading channel, a qualified product longitudinal pneumatic slide module, a qualified product vertical pneumatic slide module acted upon by the qualified product longitudinal pneumatic slide module, and a qualified product pneumatic gripper acted upon by the qualified product vertical pneumatic slide module.

[0019] The defective product unloading mechanism includes a defective product unloading channel, a defective product longitudinal pneumatic slide module, a defective product vertical pneumatic slide module acted upon by the defective product longitudinal pneumatic slide module, and a defective product pneumatic gripper acted upon by the defective product vertical pneumatic slide module.

[0020] A further configuration of the circular workstation turntable assembly in this invention is that the circular workstation turntable assembly includes a fixed disk and a rotating disk driven by a turntable motor, the pinhole tooling fixture is disposed on the rotating disk, and the fixed disk is also provided with pneumatic fingers for clamping the valve stem.

[0021] A further configuration of the first snap ring positioning detection mechanism in this invention is that the detection adjustment device includes a detection mounting plate, a detection adjustment cylinder and a detection guide rail fixed on the detection mounting plate, and a detection reference seat slidably mounted on the detection guide rail via a detection slide block, wherein the detection adjustment cylinder acts on the detection reference seat.

[0022] The contact detection assembly includes a position sensor fixed on the detection reference base, a detection telescopic base located in front of the detection reference base, a preload spring abutting between the detection reference base and the detection telescopic base, a position feedback plate fixed on the detection telescopic base, and a snap ring contact fixedly connected to the position feedback plate. The snap ring contact can abut against the snap ring on the corresponding pinhole tooling fixture.

[0023] A further configuration of the pressing mechanism in this invention is that the pressing mechanism includes a front-pushing cylinder mounted on a fixed plate, a limiting base plate acted upon by the front-pushing cylinder, a lowering cylinder mounted on the fixed plate, and a pressing die head device acted upon by the lowering cylinder, and the limiting base plate is provided with a limiting hole for the valve rod to pass through.

[0024] Furthermore, the pressing cylinder is connected to a pressing fixing plate, and the pressing die head device includes a guide plate connected to the pressing fixing plate and a die head body passing through the guide plate. The die head body is located directly below the pressing cylinder.

[0025] The pressing and fixing plate is provided with several connection holes of different sizes, and the guide plate is detachably connected to the pressing and fixing plate by fasteners;

[0026] The clamping die head device has multiple sets, and each clamping die head is adapted to one of the connecting holes.

[0027] A further configuration of the needle-type stainless steel valve stem feeding assembly mechanism in this invention is that the valve stem transfer device includes a valve stem transfer track that is connected to and communicates with the valve stem vibrating feed plate, a flipping cylinder located at the end of the valve stem transfer track, a flipping base acted upon by the flipping cylinder, and a valve picker fixed on the flipping base and having a valve stem material hole.

[0028] The valve stem assembly device includes a valve stem longitudinal pneumatic slide module, a valve stem vertical pneumatic slide module acted upon by the valve stem longitudinal pneumatic slide module, and a valve stem pneumatic gripper acted upon by the valve stem vertical pneumatic slide module.

[0029] A further configuration of the first snap ring feeding assembly mechanism and the second snap ring feeding assembly mechanism in this invention is that both the first snap ring transfer device and the second snap ring transfer device include a snap ring vertical stacking rack and a flexible channel tube connected between the snap ring vibrating feed plate and the snap ring vertical stacking rack.

[0030] The first and second snap ring assembly devices both include a horizontal rotating motor mounted on the workbench, a snap ring ejection cylinder driven by the horizontal rotating motor, and a snap ring clamp fixed to the front end of the snap ring ejection cylinder.

[0031] A further configuration of the first copper alloy end cap feeding assembly mechanism and the second copper alloy end cap feeding assembly mechanism in this invention is that the first end cap lifting device and the second end cap lifting device both include an end cap transfer bracket with an end cap receiving groove, an end cap lifting cylinder located below the end cap receiving groove, and an end cap ejector pin that is acted upon by the end cap lifting cylinder and can move in and out of the end cap receiving groove.

[0032] The first end cap assembly device and the second end cap assembly device both include an end cap longitudinal pneumatic slide module, an end cap vertical pneumatic slide module acted upon by the end cap longitudinal pneumatic slide module, and an end cap pneumatic gripper acted upon by the end cap vertical pneumatic slide module.

[0033] A further configuration of the sealing plastic sleeve feeding assembly mechanism in this invention is that the plastic sleeve lifting device includes a plastic sleeve transfer bracket with a plastic sleeve receiving groove, a plastic sleeve lifting cylinder located below the plastic sleeve receiving groove, and a plastic sleeve ejector pin that is acted upon by the plastic sleeve lifting cylinder and can enter and exit the plastic sleeve receiving groove.

[0034] The plastic sleeve assembly device includes a longitudinal pneumatic slide module for the plastic sleeve, a vertical pneumatic slide module for the plastic sleeve that is acted upon by the longitudinal pneumatic slide module for the plastic sleeve, and a pneumatic gripper for the plastic sleeve that is acted upon by the vertical pneumatic slide module for the plastic sleeve.

[0035] The present invention also provides an assembly and inspection method for stainless steel valve stems, applicable to the aforementioned automatic assembly equipment for integrated valve stems, comprising the following steps:

[0036] S1. Multiple valve stems enter the valve stem transfer track in sequence under the action of the valve stem vibrating feed plate. The valve stem at the end of the valve stem transfer track enters the valve stem material hole of the valve take-up fixture. The flipping cylinder is started to flip the valve take-up fixture upward. Then the valve stem assembly device is started and the valve stem pneumatic gripper picks up the valve stem in the valve stem material hole and moves it to the pinhole tooling fixture. Then the valve stem is sent into the tooling hole of the gel-like clamping body of the corresponding pinhole tooling fixture. After that, the rotating plate rotates one station.

[0037] S2. The first snap ring transfer device is started. The first snap ring vibrating feeder guides the first snap rings sequentially through the flexible channel tube to the snap ring vertical stacking rack. Then, the corresponding pneumatic fingers are started and clamp and fix the valve stem on the corresponding pinhole tooling fixture. Then, the first snap ring assembly device is started and uses snap ring clamps to pick up the first snap rings on the snap ring vertical stacking rack and move them to the corresponding pinhole tooling fixture to clamp the first snap rings on the valve stem. After assembly, the rotating disk rotates one station.

[0038] S3. Before starting the equipment, the detection adjustment cylinder must be used to adjust the detection reference seat to the correct initial position.

[0039] The snap ring contact can contact the first snap ring or valve stem on the corresponding pinhole tooling fixture;

[0040] When the first snap ring is assembled in place, the first snap ring pushes the detection telescopic base backward by a first displacement through the snap ring contact piece, and at the same time causes the position feedback plate to move backward by a first displacement, so that the position feedback plate and the position sensor on the detection base form a first position relationship, and the position sensor feeds back the correct signal that the assembly is in place.

[0041] When the first snap ring is not properly assembled, the first snap ring or valve stem pushes the detection telescopic base backward by a second displacement through the snap ring contact, and at the same time causes the position feedback plate to move backward by a second displacement, so that the position feedback plate and the position sensor on the detection base form a second position relationship, and the position sensor feeds back an error signal that the assembly is not in place.

[0042] After the test, the rotary table rotates one station, and at the same time the pre-tension spring automatically pushes the test reference seat forward to the initial position;

[0043] S4. The first end cover vibrating feed plate feeds the first end cover into the end cover transfer bracket in sequence. The end cover lifting cylinder is started to lift the first end cover in the end cover receiving groove through the end cover ejector pin. Then, the corresponding pneumatic finger is started and clamps and fixes the valve stem on the corresponding pin hole tooling fixture. Then the first end cover assembly device is started. The end cover pneumatic gripper clamps the first end cover on the end cover ejector pin and moves it to the corresponding pin hole tooling fixture to clamp the first end cover on the valve stem. After assembly, the rotating plate rotates one station.

[0044] S5. The vibrating feeder of the plastic sleeve feeds the plastic sleeves sequentially into the plastic sleeve transfer bracket. The plastic sleeve lifting cylinder is activated, which lifts the plastic sleeve in the plastic sleeve receiving groove through the plastic sleeve ejector pin. Then, the corresponding pneumatic finger is activated and clamps and fixes the valve stem on the corresponding pinhole tooling fixture. Then, the plastic sleeve assembly device is activated, which uses the plastic sleeve pneumatic gripper to pick up the plastic sleeve on the plastic sleeve ejector pin and move it to the corresponding pinhole tooling fixture to clamp the plastic sleeve on the valve stem. After assembly, the rotating plate rotates one station.

[0045] S6. The second end cover vibrating feed plate feeds the second end cover into the end cover transfer bracket in sequence. The end cover lifting cylinder is started to lift the second end cover in the end cover receiving groove through the end cover ejector pin. Then, the corresponding pneumatic finger is started and clamps and fixes the valve stem on the corresponding pin hole tooling fixture. Then the second end cover assembly device is started. The pneumatic gripper of the end cover picks up the second end cover on the end cover ejector pin and moves it to the corresponding pin hole tooling fixture to clamp the second end cover on the valve stem. After assembly, the rotating plate rotates one station.

[0046] S7. The second snap ring transfer device is started. The second snap ring vibrating feeder guides the second snap rings sequentially through the flexible channel tube to the snap ring vertical stacking rack. Then, the corresponding pneumatic fingers are started and clamp and fix the valve stem on the corresponding pinhole tooling fixture. Then, the second snap ring assembly device is started and uses snap ring clamps to pick up the second snap rings on the snap ring vertical stacking rack and move them to the corresponding pinhole tooling fixture to clamp the second snap rings on the valve stem. After assembly, the rotating disk rotates one station.

[0047] S8. The forward-push cylinder is activated to push the limiting base plate forward, and the valve rod corresponding to the pinhole tooling fixture is inserted into the limiting hole of the limiting base plate. The limiting base plate abuts against the first snap ring and forms a limiting fit. Then, the downward-pressing cylinder is activated to make the pressing die head device press on the part at the pinhole tooling fixture, thereby pressing the second snap ring, the second end cap, the plastic sleeve, the first end cap, and the first snap ring onto the valve rod from top to bottom.

[0048] S9. In step S3, determine whether the product is assembled correctly. If it is correct, the qualified product clamping device will be activated to clamp and move the stainless steel valve stem as a whole and place it into the qualified product unloading channel. If it is incorrect, the rotary table will rotate one station, and the defective product clamping device will be activated to clamp and move the stainless steel valve stem as a whole and place it into the defective product unloading channel.

[0049] The beneficial effects of this invention are as follows:

[0050] 1. The system enables fully automated feeding, assembly, and unloading of valve stems, first retaining rings, first copper alloy end caps, plastic sleeves, second copper alloy end caps, and second retaining rings, which can greatly reduce the workload of employees, improve production efficiency, and ensure the consistency of finished products.

[0051] Second, by setting up the first snap ring positioning detection mechanism, the assembly status of the first snap ring can be automatically detected and fed back, thereby determining whether the product assembled by the automatic assembly equipment is qualified, and appropriately activating the qualified product unloading mechanism or the defective product unloading mechanism for unloading.

[0052] Third, the relative positional relationship between the position feedback plate and the position sensor is used to determine whether the retaining ring is properly assembled. Furthermore, since the dimensions of components vary between different product specifications, the initial positions of the detection reference seat and the retaining ring contact can be pre-adjusted using a detection adjustment cylinder to meet the detection requirements of different products. Attached Figure Description

[0053] Figure 1 This is a schematic diagram of the structure of the present invention.

[0054] Figure 2 This is a top view of the present invention.

[0055] Figure 3 This is an assembly diagram of a pinhole tooling fixture.

[0056] Figure 4 This is a schematic diagram of the needle-type stainless steel valve stem feeding assembly mechanism.

[0057] Figure 5 This is a schematic diagram of the valve clamp usage.

[0058] Figure 6 This is a schematic diagram of the first snap ring feeding assembly mechanism.

[0059] Figure 7 This is a schematic diagram of the first snap ring positioning and detection mechanism.

[0060] Figure 8 This is a schematic diagram of the first copper alloy end cap feeding assembly mechanism.

[0061] Figure 9 This is a schematic diagram of the sealing plastic sleeve feeding and assembly mechanism.

[0062] Figure 10 This is a schematic diagram of the press-fitting mechanism.

[0063] Figure 11 This is a schematic diagram of the qualified product unloading mechanism and the defective product unloading mechanism.

[0064] Figure 12 This is a schematic diagram of the assembly process for an integrated valve stem.

[0065] In the diagram: 1. Workbench; 2. Circular station turntable assembly; 201. Pinhole tooling fixture; 2011. Rigid base; 2012. Gel-like clamping body; 2013. Tooling hole; 2014. Flared area; 202. Fixed plate; 203. Rotating plate; 204. Turntable motor; 205. Pneumatic finger; 3. Needle-type stainless steel valve stem feeding assembly mechanism; 301. Valve stem vibrating feed plate; 302. Valve stem transfer track; 303. Tilting cylinder; 304. Tilting base; 305. Valve retrieval fixture; 3051. Valve stem material hole; 306. Valve stem longitudinal pneumatic slide module; 307. Valve stem vertical pneumatic slide module; 308. Valve stem pneumatic gripper; 4. First snap ring feeding assembly mechanism; 401. First snap ring vibrating feed plate; 402. Snap ring vertical stacking rack; 403. Flexible channel tube; 404. Horizontal rotation motor; 405. Snap ring ejection cylinder; 406. Snap ring clamp; 5. First snap ring positioning detection mechanism; 501. Detection mounting plate; 502. Detection adjustment cylinder; 503. Detection guide rail; 504. Detection slide; 505. Detection reference base; 506. Position sensor; 507. Detection telescopic base; 508. Preload spring; 509. Position feedback plate; 510. Snap ring contact; 6. First copper alloy end cap feeding assembly mechanism; 601. First end cap vibrating feed plate; 602. End cap transfer bracket; 6021. End cap receiving groove; 603. End cap upper lifting cylinder; 604. End cap ejector pin; 605. End cap longitudinal pneumatic slide. 606. End cap vertical pneumatic slide module; 607. End cap pneumatic gripper; 608. First bracket adjustment cylinder; 609. First bracket adjustment base; 7. Sealing plastic sleeve feeding assembly mechanism; 701. Plastic sleeve vibrating feed plate; 702. Plastic sleeve transfer bracket; 7021. Plastic sleeve receiving groove; 703. Plastic sleeve upper lifting cylinder; 704. Plastic sleeve ejector pin; 705. Plastic sleeve longitudinal pneumatic slide module; 706. Plastic sleeve vertical pneumatic slide module; 707. Plastic sleeve pneumatic gripper; 708. Second bracket adjustment cylinder; 709. Second bracket adjustment base; 8. Second copper alloy end cap feeding assembly mechanism; 9. Second snap ring feeding assembly mechanism; 10. Pressing mechanism; 1001. Forward push cylinder; 100 2. Limiting base plate; 1003. Limiting hole; 1004. Lower pressure fixing plate; 1005. Guide plate; 1006. Die head body; 1007. Connecting hole; 11. Qualified product unloading mechanism; 1101. Qualified product unloading channel; 1102. Qualified product longitudinal pneumatic slide module; 1103. Qualified product vertical pneumatic slide module; 1104. Qualified product pneumatic gripper; 12. Defective product unloading mechanism; 1201. Defective product unloading channel; 1202. Defective product longitudinal pneumatic slide module; 1203. Defective product vertical pneumatic slide module; 1204. Defective product pneumatic gripper; 1301. Valve stem; 1302. First retaining ring; 1303. First end cap; 1304. Plastic sleeve; 1305. Second end cap; 1306. Second retaining ring. Detailed Implementation

[0066] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0067] Example 1

[0068] Reference Figures 1-12An automatic assembly device for integrated valve stems includes: a workbench 1 and a control device (not shown in the figure). The workbench 1 is equipped with a circular station turntable assembly 2. The circular station turntable assembly 2 has several stations, each equipped with a pinhole tooling fixture 201 adapted to the integrated valve stem. The circular station turntable is surrounded by, in sequence, a needle-type stainless steel valve stem feeding assembly mechanism 3, a first snap ring feeding assembly mechanism 4, a first snap ring positioning and detection mechanism 5, a first copper alloy end cap feeding assembly mechanism 6, a sealing plastic sleeve feeding assembly mechanism 7, a second copper alloy end cap feeding assembly mechanism 8, a second snap ring feeding assembly mechanism 9, a pressing mechanism 10, a qualified product unloading mechanism 11, and a defective product unloading mechanism 12. Among them, the stainless steel valve stem is a relatively slender component, and its surface must be effectively protected during production to prevent bumps, scratches, and other problems. Therefore, according to actual needs, the pinhole tooling fixture 201 of this invention includes a rigid base 2011 and an adhesive clamping body 2012 fixed in the rigid base 2011. The adhesive clamping body has a tooling hole 2013 adapted to the needle-type stainless steel valve stem. The rigid base 2011 provides support and increases structural stability; the adhesive clamping body 2012 provides the tooling hole 2013 for valve stem insertion and directly contacts the valve stem. Through the adhesive properties (generally elastic hard rubber), it provides cushioning and anti-slip properties during contact and provides wrapping and support functions during assembly. Furthermore, the upper end of the tooling hole 2013 has a flared area 2014 to guide the valve stem insertion, allowing the valve stem to pass more smoothly through the flared area 2014 and be inserted into the tooling hole 2013.The needle-type stainless steel valve stem feeding assembly mechanism 3 includes a valve stem vibrating feed plate 301, a valve stem transfer device, and a valve stem assembly device; the first snap ring feeding assembly mechanism 4 includes a first snap ring vibrating feed plate 401, a first snap ring transfer device, and a first snap ring assembly device; the first snap ring positioning detection mechanism 5 includes a contact detection component and a detection and adjustment device acting on the contact detection component, the contact detection component being communicatively connected to the control device; the first copper alloy end cap feeding assembly mechanism 6 includes a first end cap vibrating feed plate 601, a first end cap lifting device, and a first end cap assembly device; the sealing plastic sleeve feeding assembly mechanism 7 includes a plastic sleeve vibrating feed plate 701, a plastic sleeve lifting device, and a plastic sleeve assembly device; the second copper alloy end cap feeding assembly mechanism 8 includes... The second end cap vibrating feed plate, the second end cap top device, and the second end cap assembly device; the second snap ring feeding assembly mechanism 9 includes a second snap ring vibrating feed plate, a second snap ring transfer device, and a second snap ring assembly device; the qualified product unloading mechanism 11 includes a qualified product unloading channel 1101, a qualified product longitudinal pneumatic slide module 1102, a qualified product vertical pneumatic slide module 1103 acting on the qualified product longitudinal pneumatic slide module 1102, and a qualified product pneumatic gripper 1104 acting on the qualified product vertical pneumatic slide module 1103; the defective product unloading mechanism 12 includes a defective product unloading channel 1201, a defective product longitudinal pneumatic slide module 1202, a defective product vertical pneumatic slide module 1203 acting on the defective product longitudinal pneumatic slide module 1202, and a defective product pneumatic gripper 1204 acting on the defective product vertical pneumatic slide module 1203.

[0069] The above content constitutes the basic structural scheme of this invention, which enables automatic feeding, assembly, inspection, and unloading of the valve stem, first retaining ring, first copper alloy end cap, plastic sleeve, second copper alloy end cap, and second retaining ring. This can greatly reduce the workload of employees, improve production efficiency, and ensure the consistency of finished products.

[0070] Example 2

[0071] Based on the structure of Embodiment 1, this embodiment improves the composition of each mechanism with a more preferred arrangement, referring to... Figures 1-12 Specifically:

[0072] 1. Circular Turntable Assembly 2: This assembly includes a fixed plate 202 and a rotating plate 203 driven by a turntable motor 204. The pinhole tooling fixture 201 is mounted on the rotating plate 203, and the fixed plate 202 is also equipped with pneumatic fingers 205 for clamping the valve stem. The pinhole tooling fixture 201 serves to accommodate and support the valve stem. However, when assembling other components onto the valve stem, contact and interaction forces inevitably exist, which may cause the valve stem to deviate or be improperly assembled, leading to incomplete assembly. The pneumatic fingers 205 effectively clamp and position the valve stem on the pinhole tooling fixture 201, preventing displacement of the valve stem during assembly and ensuring that all components are assembled correctly.

[0073] II. Detection and adjustment device: including detection mounting plate 501, detection and adjustment cylinder 502 fixed on detection mounting plate 501 and detection guide rail 503, and detection reference seat 505 slidably mounted on detection guide rail 503 via detection slide 504, wherein the detection and adjustment cylinder 502 acts on the detection reference seat 505.

[0074] The contact detection assembly includes a position sensor 506 fixed on the detection reference base 505, a detection telescopic base 507 located in front of the detection reference base 505, a preload spring 508 abutting between the detection reference base 505 and the detection telescopic base 507, a position feedback plate 509 fixed on the detection telescopic base 507, and a snap ring contact 510 fixedly connected to the position feedback plate 509. The snap ring contact 510 can abut against the snap ring on the corresponding pinhole tooling fixture 201.

[0075] The relative position of the position feedback plate 509 and the position sensor 506 is used to determine whether the retaining ring is properly assembled. Meanwhile, since the dimensions of components vary between different product specifications, the initial positions of the detection reference seat 505 and the retaining ring contact 510 can be pre-adjusted using the detection adjustment cylinder 502 to meet the detection requirements of different products.

[0076] 3. Pressing mechanism 10: includes a front push cylinder 1001 set on the fixed plate 202, a limiting base plate 1002 acted upon by the front push cylinder 1001, a downward press cylinder set on the fixed plate 202, and a pressing die head device acted upon by the downward press cylinder, and the limiting base plate 1002 is provided with a limiting hole 1003 for the valve rod to pass through.

[0077] If all components are not tightly clamped after assembly onto the valve stem, loosening or other issues can easily occur later in the product assembly. Therefore, a clamping die is used to clamp the components, ensuring that each product is properly and securely assembled.

[0078] Furthermore, the pressing cylinder is connected to a pressing fixing plate 1004, and the pressing die head device includes a guide plate 1005 connected to the pressing fixing plate 1004 and a die head body 1006 passing through the guide plate 1005. The die head body 1006 is located directly below the pressing cylinder. The pressing fixing plate 1004 has several connecting holes 1007 of different sizes. The guide plate 1005 is detachably connected to the pressing fixing plate 1004 by fasteners (screws, etc.). There are multiple sets of pressing die head devices, and each pressing die head is adapted to one of the connecting holes 1007, so that the user can replace the pressing die head to adapt to the needs of products of different sizes and specifications.

[0079] IV. Valve stem transfer device: including a valve stem transfer track 302 that is connected to and communicates with the valve stem vibrating feed plate 301, a tilting cylinder 303 located at the end of the valve stem transfer track 302, a tilting base 304 acted upon by the tilting cylinder 303, and a valve retrieval clamp 305 fixed on the tilting base 304 and having a valve stem material hole 3051; the valve stem assembly device includes a valve stem longitudinal pneumatic slide module 306, a valve stem vertical pneumatic slide module 307 acted upon by the valve stem longitudinal pneumatic slide module 306, and a valve stem pneumatic gripper 308 acted upon by the valve stem vertical pneumatic slide module 307.

[0080] V. The first snap ring feeding assembly mechanism 4 and the second snap ring feeding assembly mechanism 9 have the same structure and execution method: both include a snap ring vertical stacking rack 402 and a flexible channel tube 403 connected between the snap ring vibrating feed plate and the snap ring vertical stacking rack 402; the first snap ring assembly device and the second snap ring assembly device both include a horizontal rotating motor 404 installed on the workbench 1, a snap ring ejection cylinder 405 driven by the horizontal rotating motor 404, and a snap ring clamp 406 fixed to the front end of the snap ring ejection cylinder 405.

[0081] VI. The first copper alloy end cap feeding assembly mechanism 6 and the second copper alloy end cap feeding assembly mechanism 8 have the same structure and execution method: both include an end cap transfer bracket 602 with an end cap receiving groove 6021, an end cap lifting cylinder 603 located below the end cap receiving groove 6021, and an end cap ejector pin 604 that is acted upon by the end cap lifting cylinder 603 and can enter and exit the end cap receiving groove 6021; the first end cap assembly device and the second end cap assembly device both include an end cap longitudinal pneumatic slide module 605, an end cap vertical pneumatic slide module 606 acted upon by the end cap longitudinal pneumatic slide module 605, and an end cap pneumatic gripper 607 acted upon by the end cap vertical pneumatic slide module 606.

[0082] More specifically, the first end cap lifting device and the second end cap lifting device further include a first bracket adjusting cylinder 608 and a first bracket adjusting base 609 acted upon by the first bracket adjusting cylinder 608. The end cap transfer bracket 602 and the end cap lifting cylinder 603 are both mounted on the first bracket adjusting base 609. Therefore, the initial position of the first bracket adjusting base 609 can be adjusted by the first bracket adjusting cylinder 608, that is, the initial positions of the end cap transfer bracket 602 and the end cap lifting cylinder 603 are adjusted to meet the needs of products with different sizes and specifications.

[0083] VII. Plastic sleeve lifting device: including a plastic sleeve transfer bracket 702 with a plastic sleeve receiving groove 7021, a plastic sleeve lifting cylinder 703 located below the plastic sleeve receiving groove 7021, and a plastic sleeve ejector pin 704 that is acted upon by the plastic sleeve lifting cylinder 703 and can move in and out of the plastic sleeve receiving groove 7021; the plastic sleeve assembly device includes a plastic sleeve longitudinal pneumatic slide module 705, a plastic sleeve vertical pneumatic slide module 706 acted upon by the plastic sleeve longitudinal pneumatic slide module 705, and a plastic sleeve pneumatic gripper 707 acted upon by the plastic sleeve vertical pneumatic slide module 706.

[0084] More specifically, the plastic sleeve lifting device further includes a second bracket adjusting cylinder 708 and a second bracket adjusting base 709 acted upon by the second bracket adjusting cylinder 708. The plastic sleeve lifting cylinder 703 and the plastic sleeve transfer bracket 702 are both mounted on the second bracket adjusting base 709. Therefore, the initial position of the second bracket adjusting base 709 can be adjusted by the second bracket adjusting cylinder 708, thus adjusting the initial positions of the plastic sleeve lifting cylinder 703 and the plastic sleeve transfer bracket 702 to meet the needs of products of different sizes and specifications.

[0085] Example 3

[0086] Based on the automatic assembly equipment structure of the integrated valve stem in Embodiment 2, this embodiment provides an assembly and inspection method for stainless steel valve stems, referring to... Figures 1-12 This includes the following steps:

[0087] S1. Multiple valve stems enter the valve stem transfer track 302 in sequence under the action of the valve stem vibrating feed plate 301. The last valve stem of the valve stem transfer track 302 enters the valve stem material hole 3051 of the valve take-up clamp 305. The flipping cylinder 303 is activated to flip the valve take-up clamp 305 upward. Then the valve stem assembly device is activated and the valve stem pneumatic gripper 308 picks up the valve stem in the valve stem material hole 3051 and moves it to the pin hole tooling fixture 201. Then the valve stem is sent into the tooling hole 2013 of the gel-like clamping body 2012 of the corresponding pin hole tooling fixture 201. After that, the rotating plate 203 rotates one station.

[0088] S2. The first snap ring transfer device is started. The first snap ring vibrating feed plate 401 guides the first snap rings in sequence through the flexible channel tube 403 to the snap ring vertical stacking rack 402. Then, the corresponding pneumatic finger 205 is started and clamps and fixes the valve stem on the corresponding pinhole tooling fixture 201. Then, the first snap ring assembly device is started and uses snap ring clamps 406 to pick up the first snap ring on the snap ring vertical stacking rack 402 and move it to the corresponding pinhole tooling fixture 201 to clamp the first snap ring on the valve stem. After assembly, the rotating plate 203 rotates one station.

[0089] S3. Before starting the equipment, the detection adjustment cylinder 502 must be used to adjust the detection reference seat 505 to the correct initial position.

[0090] The snap ring contact 510 can contact the first snap ring or valve stem on the corresponding pinhole tooling fixture 201;

[0091] When the first snap ring is assembled in place, the first snap ring pushes the detection telescopic base 507 backward by a first displacement through the snap ring contact 510, and at the same time causes the position feedback plate 509 to move backward by a first displacement, so that the position feedback plate 509 and the position sensor 506 on the detection reference base 505 form a first position relationship, and the position sensor 506 feeds back the correct signal that the assembly is in place.

[0092] When the first snap ring is not properly assembled, the first snap ring or valve stem pushes the detection telescopic base 507 backward by a second displacement through the snap ring contact 510, and at the same time causes the position feedback plate 509 to move backward by a second displacement, so that the position feedback plate 509 and the position sensor 506 on the detection reference base 505 form a second position relationship, and the position sensor 506 feeds back an error signal that the assembly is not in place.

[0093] After the test, the rotating disk 203 rotates one station, and at the same time the pre-tension spring 508 automatically pushes the test reference seat 505 forward to the initial position;

[0094] S4. The first end cover vibrating feed plate 601 feeds the first end cover into the end cover transfer bracket 602 in sequence. The end cover lifting cylinder 603 is activated to lift the first end cover in the end cover receiving groove 6021 through the end cover ejector pin 604. Then, the corresponding pneumatic finger 205 is activated and clamps and fixes the valve stem on the corresponding pinhole tooling fixture 201. Then, the first end cover assembly device is activated and the first end cover on the end cover ejector pin 604 is clamped and moved to the corresponding pinhole tooling fixture 201 through the end cover pneumatic gripper 607 to clamp the first end cover on the valve stem. After assembly, the rotating plate 203 rotates one station.

[0095] S5. The plastic sleeve vibrating feed plate 701 feeds the plastic sleeves sequentially into the plastic sleeve transfer bracket 702. The plastic sleeve lifting cylinder 703 is activated to lift the plastic sleeve in the plastic sleeve receiving groove 7021 through the plastic sleeve ejector pin 704. Then, the corresponding pneumatic finger 205 is activated and clamps and fixes the valve stem on the corresponding pinhole tooling fixture 201. Then, the plastic sleeve assembly device is activated and the plastic sleeve pneumatic gripper 707 clamps the plastic sleeve on the plastic sleeve ejector pin 704 and moves it to the corresponding pinhole tooling fixture 201 to clamp the plastic sleeve on the valve stem. After assembly, the rotating plate 203 rotates one station.

[0096] S6. The second end cover vibrating feeder sequentially feeds the second end cover into the end cover transfer bracket 602. The end cover lifting cylinder 603 is activated to lift the second end cover in the end cover receiving groove 6021 through the end cover ejector pin 604. Then, the corresponding pneumatic finger 205 is activated and clamps and fixes the valve stem on the corresponding pinhole tooling fixture 201. Then, the second end cover assembly device is activated and the end cover pneumatic gripper 607 clamps the second end cover on the end cover ejector pin 604 and moves it to the corresponding pinhole tooling fixture 201 to clamp the second end cover on the valve stem. After assembly, the rotating disk 203 rotates one station.

[0097] S7. The second snap ring transfer device is started. The second snap ring vibrating feeder guides the second snap rings sequentially through the flexible channel tube 403 to the snap ring vertical stacking rack 402. Then, the corresponding pneumatic finger 205 is started and clamps and fixes the valve stem on the corresponding pinhole tooling fixture 201. Then, the second snap ring assembly device is started and uses snap ring clamps 406 to pick up the second snap rings on the snap ring vertical stacking rack 402 and move them to the corresponding pinhole tooling fixture 201 to clamp the second snap rings on the valve stem. After assembly, the rotating disk 203 rotates one station.

[0098] S8. The forward-pushing cylinder 1001 is activated to push the limiting base plate 1002 forward, and the valve rod corresponding to the pinhole tooling fixture 201 is inserted into the limiting hole 1003 of the limiting base plate 1002. The limiting base plate 1002 abuts against the first snap ring and forms a limiting fit. Then, the downward-pressing cylinder is activated to press the clamping die head device onto the part at the pinhole tooling fixture 201, thereby pressing the second snap ring 1306, the second end cap 1305, the plastic sleeve 1304, the first end cap 1303, and the first snap ring 1302 from top to bottom onto the valve rod 1301.

[0099] S9. In step S3, determine whether the product is assembled correctly. If it is, the qualified product clamping device is activated to clamp and move the stainless steel valve stem as a whole and place it into the qualified product unloading channel 1101. If it is not qualified, the rotating disk 203 rotates one station, and the defective product clamping device is activated to clamp and move the stainless steel valve stem as a whole and place it into the defective product unloading channel 1201.

[0100] The above description is merely a preferred embodiment of the present invention and does not constitute any limitation on the present invention. Any simple modifications, alterations, or equivalent structural changes made to the above embodiments based on the technical essence of the invention shall still fall within the protection scope of the present invention.

Claims

1. Automated assembly equipment for integrated valve stems, including: A workbench (1) and a control device, wherein a circular workstation turntable assembly (2) is provided on the workbench (1); The circular workstation turntable assembly (2) is provided with several workstations, and each workstation is provided with a pinhole tooling fixture (201) adapted to the integrated valve stem; The feature is that the circular workstation turntable is surrounded by a needle-type stainless steel valve stem feeding assembly mechanism (3), a first snap ring feeding assembly mechanism (4), a first snap ring positioning detection mechanism (5), a first copper alloy end cap feeding assembly mechanism (6), a sealing plastic sleeve feeding assembly mechanism (7), a second copper alloy end cap feeding assembly mechanism (8), a second snap ring feeding assembly mechanism (9), a pressing mechanism (10), a qualified product unloading mechanism (11), and a defective product unloading mechanism (12). The pinhole tooling fixture (201) includes a rigid base (2011) and an adhesive clamping body (2012) fixed in the rigid base (2011). The adhesive clamping body has a tooling hole (2013) adapted to the needle-type stainless steel valve stem, and the upper end of the tooling hole (2013) has a flared area (2014). The needle-type stainless steel valve stem feeding assembly mechanism (3) includes a valve stem vibrating feed plate (301), a valve stem transfer device, and a valve stem assembly device. The first snap ring feeding assembly mechanism (4) includes a first snap ring vibrating feeding disc (401), a first snap ring transfer device, and a first snap ring assembly device; The first snap ring positioning detection mechanism (5) includes a contact detection component and a detection adjustment device acting on the contact detection component. The contact detection component is communicatively connected to the control device. The first copper alloy end cap feeding and assembly mechanism (6) includes a first end cap vibrating feeding plate (601), a first end cap top device, and a first end cap assembly device. The sealing plastic sleeve feeding and assembly mechanism (7) includes a plastic sleeve vibrating feeding plate (701), a plastic sleeve upper lifting device, and a plastic sleeve assembly device; The second copper alloy end cap feeding and assembly mechanism (8) includes a second end cap vibrating feeding plate, a second end cap top device, and a second end cap assembly device; The second snap ring feeding and assembly mechanism (9) includes a second snap ring vibrating feeder, a second snap ring transfer device, and a second snap ring assembly device; The qualified product unloading mechanism (11) includes a qualified product unloading channel (1101), a qualified product longitudinal pneumatic slide module (1102), a qualified product vertical pneumatic slide module (1103) acted upon by the qualified product longitudinal pneumatic slide module (1102), and a qualified product pneumatic gripper (1104) acted upon by the qualified product vertical pneumatic slide module (1103). The defective product unloading mechanism (12) includes a defective product unloading channel (1201), a defective product longitudinal pneumatic slide module (1202), a defective product vertical pneumatic slide module (1203) acted upon by the defective product longitudinal pneumatic slide module (1202), and a defective product pneumatic gripper (1204) acted upon by the defective product vertical pneumatic slide module (1203).

2. The automatic assembly equipment for integrated valve stems according to claim 1, characterized in that: The circular workstation turntable assembly (2) includes a fixed plate (202) and a rotating plate (203) driven by a turntable motor (204). The pinhole tooling fixture (201) is set on the rotating plate (203), and the fixed plate (202) is also provided with a pneumatic finger (205) for clamping the valve stem.

3. The automatic assembly equipment for integrated valve stems according to claim 2, characterized in that: The detection adjustment device includes a detection mounting plate (501), a detection adjustment cylinder (502) fixed on the detection mounting plate (501), a detection guide rail (503), and a detection reference seat (505) slidably mounted on the detection guide rail (503) via a detection slide (504), wherein the detection adjustment cylinder (502) acts on the detection reference seat (505); The contact detection assembly includes a position sensor (506) fixed on the detection reference base (505), a detection telescopic base (507) located in front of the detection reference base (505), a preload spring (508) abutting between the detection reference base (505) and the detection telescopic base (507), a position feedback plate (509) fixed on the detection telescopic base (507), and a snap ring contact (510) fixedly connected to the position feedback plate (509). The snap ring contact (510) can abut against the snap ring on the corresponding pinhole tooling fixture (201).

4. The automatic assembly equipment for integrated valve stems according to claim 3, characterized in that: The pressing mechanism (10) includes a forward-pushing cylinder (1001) mounted on a fixed plate (202), a limiting base plate (1002) acted upon by the forward-pushing cylinder (1001), a downward-pressing cylinder mounted on the fixed plate (202), and a pressing die head device acted upon by the downward-pressing cylinder. The limiting base plate (1002) is provided with a limiting hole (1003) for the valve rod to pass through.

5. The automatic assembly equipment for integrated valve stems according to claim 4, characterized in that: The pressing cylinder is connected to a pressing fixing plate (1004), and the pressing die head device includes a guide plate (1005) connected to the pressing fixing plate (1004) and a die head body (1006) passing through the guide plate (1005). The die head body (1006) is located directly below the pressing cylinder. The pressing fixing plate (1004) is provided with a number of connection holes (1007) of different sizes, and the guide plate (1005) is detachably connected to the pressing fixing plate (1004) by fasteners. The clamping die head device has multiple sets, and each clamping die head is adapted to one of the connecting holes (1007).

6. The automatic assembly equipment for integrated valve stems according to claim 5, characterized in that: The valve stem transfer device includes a valve stem transfer track (302) that is connected to and communicates with the valve stem vibrating feed plate (301), a tilting cylinder (303) located at the end of the valve stem transfer track (302), a tilting base (304) acted upon by the tilting cylinder (303), and a valve picker (305) fixed on the tilting base (304) and having a valve stem material hole (3051). The valve stem assembly device includes a valve stem longitudinal pneumatic slide module (306), a valve stem vertical pneumatic slide module (307) acted upon by the valve stem longitudinal pneumatic slide module (306), and a valve stem pneumatic gripper (308) acted upon by the valve stem vertical pneumatic slide module (307).

7. The automatic assembly equipment for integrated valve stems according to claim 6, characterized in that: The first and second snap ring transfer devices both include a snap ring vertical stacking rack (402) and a flexible channel tube (403) connecting the snap ring vibrating feed plate and the snap ring vertical stacking rack (402); The first snap ring assembly device and the second snap ring assembly device both include a horizontal rotating motor (404) mounted on the workbench (1), a snap ring ejection cylinder (405) driven by the horizontal rotating motor (404), and a snap ring clamp (406) fixed to the front end of the snap ring ejection cylinder (405).

8. The automatic assembly equipment for an integrated valve stem according to claim 7, characterized in that: The first end cap lifting device and the second end cap lifting device both include an end cap transfer bracket (602) with an end cap receiving groove (6021), an end cap lifting cylinder (603) located below the end cap receiving groove (6021), and an end cap ejector pin (604) that is acted upon by the end cap lifting cylinder (603) and can enter and exit the end cap receiving groove (6021). The first end cap assembly device and the second end cap assembly device both include an end cap longitudinal pneumatic slide module (605), an end cap vertical pneumatic slide module (606) acted upon by the end cap longitudinal pneumatic slide module (605), and an end cap pneumatic gripper (607) acted upon by the end cap vertical pneumatic slide module (606).

9. The automatic assembly equipment for an integrated valve stem according to claim 8, characterized in that: The plastic sleeve lifting device includes a plastic sleeve transfer bracket (702) with a plastic sleeve receiving groove (7021), a plastic sleeve lifting cylinder (703) located below the plastic sleeve receiving groove (7021), and a plastic sleeve ejector pin (704) that is acted upon by the plastic sleeve lifting cylinder (703) and can enter and exit the plastic sleeve receiving groove (7021). The plastic sleeve assembly device includes a plastic sleeve longitudinal pneumatic slide module (705), a plastic sleeve vertical pneumatic slide module (706) acted upon by the plastic sleeve longitudinal pneumatic slide module (705), and a plastic sleeve pneumatic gripper (707) acted upon by the plastic sleeve vertical pneumatic slide module (706).

10. An assembly and inspection method for stainless steel valve stems, applicable to the automatic assembly equipment for the integrated valve stem as described in claim 9, characterized in that, Includes the following steps: S1. Multiple valve stems enter the valve stem transfer track (302) in sequence under the action of the valve stem vibrating feed plate (301). The valve stem at the end of the valve stem transfer track (302) enters the valve stem material hole (3051) of the valve take-up clamp (305). The flipping cylinder (303) is started to flip the valve take-up clamp (305) upward. Then the valve stem assembly device is started and the valve stem pneumatic gripper (308) is used to clamp the valve stem in the valve stem material hole (3051) and move it to the pin hole tooling fixture (201). Then the valve stem is sent into the tooling hole (2013) of the gel-like clamping body (2012) of the corresponding pin hole tooling fixture (201). After that, the rotating plate (203) rotates one station. S2. The first snap ring transfer device is started. The first snap ring vibrating feed plate (401) guides the first snap rings sequentially through the flexible channel tube (403) to the snap ring vertical stacking rack (402). Then, the corresponding pneumatic finger (205) is started and clamps and fixes the valve stem on the corresponding pinhole tooling fixture (201). Then, the first snap ring assembly device is started and clamps the first snap ring on the snap ring vertical stacking rack (402) through the snap ring clamp (406) and moves it to the corresponding pinhole tooling fixture (201) to clamp the first snap ring on the valve stem. After assembly, the rotating plate (203) rotates one station. S3. Before starting the equipment, the detection adjustment cylinder (502) needs to be adjusted to the detection reference seat (505) to the correct initial position; The snap ring contact (510) can contact the first snap ring or valve stem on the corresponding pinhole tooling fixture (201); When the first snap ring is assembled in place, the first snap ring pushes the detection telescopic base (507) backward by a first displacement through the snap ring contact (510), and at the same time causes the position feedback plate (509) to move backward by a first displacement, so that the position feedback plate (509) and the position sensor (506) on the detection reference base (505) form a first position relationship, and the position sensor (506) feeds back the correct signal that the assembly is in place; When the first snap ring is not in place, the first snap ring or valve stem pushes the detection telescopic base (507) backward by a second displacement through the snap ring contact (510), and at the same time causes the position feedback plate (509) to move backward by a second displacement, so that the position feedback plate (509) and the position sensor (506) on the detection reference base (505) form a second position relationship, and the position sensor (506) feeds back an error signal that the assembly is not in place; After the test, the rotating disk (203) rotates one station, and at the same time the pre-tension spring (508) automatically pushes the test reference seat (505) forward to the initial position; S4. The first end cover vibrating feed plate (601) feeds the first end cover into the end cover transfer bracket (602) in sequence. The end cover lifting cylinder (603) is started to lift the first end cover in the end cover receiving groove (6021) through the end cover ejector pin (604). Then the corresponding pneumatic finger (205) is started and clamps and fixes the valve stem on the corresponding pin hole tooling fixture (201). Then the first end cover assembly device is started and the first end cover on the end cover ejector pin (604) is clamped and moved to the corresponding pin hole tooling fixture (201) through the end cover pneumatic gripper (607) so as to clamp the first end cover on the valve stem. After assembly, the rotating plate (203) rotates one station. S5. The plastic sleeve vibrating feeder (701) feeds the plastic sleeves sequentially into the plastic sleeve transfer bracket (702). The plastic sleeve lifting cylinder (703) is activated and the plastic sleeve ejector pin (704) lifts the plastic sleeve in the plastic sleeve receiving groove (7021). Then, the corresponding pneumatic finger (205) is activated and clamps and fixes the valve stem on the corresponding pinhole tooling fixture (201). Then, the plastic sleeve assembly device is activated and the plastic sleeve pneumatic gripper (707) clamps the plastic sleeve on the plastic sleeve ejector pin (704) and moves it to the corresponding pinhole tooling fixture (201) to clamp the plastic sleeve on the valve stem. After assembly, the rotating disk (203) rotates one station. S6. The second end cover vibrating feeder sequentially feeds the second end cover into the end cover transfer bracket (602). The end cover lifting cylinder (603) is activated to lift the second end cover in the end cover receiving groove (6021) through the end cover ejector pin (604). Then, the corresponding pneumatic finger (205) is activated and clamps and fixes the valve stem on the corresponding pinhole tooling fixture (201). Then, the second end cover assembly device is activated and the second end cover on the end cover ejector pin (604) is clamped and moved to the corresponding pinhole tooling fixture (201) through the end cover pneumatic gripper (607) to clamp the second end cover on the valve stem. After assembly, the rotating disk (203) rotates one station. S7. The second snap ring transfer device is started. The second snap ring vibrating feeder guides the second snap rings sequentially through the flexible channel tube (403) to the snap ring vertical stacking rack (402). Then, the corresponding pneumatic finger (205) is started and clamps and fixes the valve stem on the corresponding pinhole tooling fixture (201). Then, the second snap ring assembly device is started and uses snap ring clamps (406) to pick up the second snap ring on the snap ring vertical stacking rack (402) and move it to the corresponding pinhole tooling fixture (201) to clamp the second snap ring on the valve stem. After assembly, the rotating disk (203) rotates one station. S8. The forward-pushing cylinder (1001) is activated to push the limiting base plate (1002) forward. The valve rod corresponding to the pinhole tooling fixture (201) is inserted into the limiting hole (1003) of the limiting base plate (1002). The limiting base plate (1002) abuts against the first snap ring and forms a limiting fit. Then, the downward-pressing cylinder is activated to press the pressing die head device onto the part at the pinhole tooling fixture (201), thereby pressing the second snap ring, the second end cap, the plastic sleeve, the first end cap, and the first snap ring onto the valve rod from top to bottom. S9. In step S3, determine whether the product is assembled successfully; If the product is qualified, the qualified product clamping device will be activated to clamp and move the stainless steel valve stem as a whole and place it into the qualified product unloading channel (1101); if the product is unqualified, the rotating disk (203) will rotate one station, and the defective product clamping device will be activated to clamp and move the stainless steel valve stem as a whole and place it into the defective product unloading channel (1201).

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